Digit value: The actual value of a digit based on its position in a number. Calculated as digit × place value.
- Identify the place value of each digit (thousands, hundreds, tens, ones)
- Multiply each digit by its place value
- State the value of each digit
5 is in the thousands place (value: 5 × 1,000 = 5,000)
4 is in the hundreds place (value: 4 × 100 = 400)
3 is in the tens place (value: 3 × 10 = 30)
2 is in the ones place (value: 2 × 1 = 2)
Value of 5 = 5,000
Value of 4 = 400
Value of 3 = 30
Value of 2 = 2
5,000 + 400 + 30 + 2 = 5,432 ✓
Value of 5 = 5,000
Value of 4 = 400
Value of 3 = 30
Value of 2 = 2
• Place value: Each position has a specific value (ones, tens, hundreds, thousands)
• Multiplication: Multiply each digit by its place value
• Verification: Sum of all digit values equals the original number
Numbers with zeros: Even if a digit is zero, it still represents a place value position.
7 is in the thousands place (value: 7 × 1,000 = 7,000)
0 is in the hundreds place (value: 0 × 100 = 0)
8 is in the tens place (value: 8 × 10 = 80)
0 is in the ones place (value: 0 × 1 = 0)
Value of 7 = 7,000
Value of 0 = 0
Value of 8 = 80
Value of 0 = 0
7,000 + 0 + 80 + 0 = 7,080 ✓
Value of 7 = 7,000
Value of 0 = 0
Value of 8 = 80
Value of 0 = 0
• Zero handling: Zeros still represent their place value position even though the product is 0
• Place value preservation: Every position matters in the number's structure
• Verification: The sum of all digit values equals the original number
Large numbers: Follow the same pattern but include ten thousands place.
4 is in the ten thousands place (value: 4 × 10,000 = 40,000)
5 is in the thousands place (value: 5 × 1,000 = 5,000)
6 is in the hundreds place (value: 6 × 100 = 600)
7 is in the tens place (value: 7 × 10 = 70)
8 is in the ones place (value: 8 × 1 = 8)
Value of 4 = 40,000
Value of 5 = 5,000
Value of 6 = 600
Value of 7 = 70
Value of 8 = 8
40,000 + 5,000 + 600 + 70 + 8 = 45,678 ✓
Value of 4 = 40,000
Value of 5 = 5,000
Value of 6 = 600
Value of 7 = 70
Value of 8 = 8
• Large numbers: Same process but with more place value positions
• Systematic approach: Work from left to right (largest to smallest place values)
• Verification: Ensure all digit values sum to the original number
Place value: The value of a digit based on its position in a number
Digit value: The actual value of a digit, calculated as digit × place value
Standard form: The normal way of writing numbers
Expanded form: Writing a number showing the value of each digit
- Start from the right: Ones, tens, hundreds, thousands, ten thousands...
- Count positions: Each position is 10 times larger than the one before
- Multiply: Each digit by its place value
- Verify: Ensure all digit values sum to the original number
Decimal numbers: Include place values to the right of the decimal point (tenths, hundredths, thousandths).
4 is in the tens place (value: 4 × 10 = 40)
5 is in the ones place (value: 5 × 1 = 5)
6 is in the tenths place (value: 6 × 0.1 = 0.6)
7 is in the hundredths place (value: 7 × 0.01 = 0.07)
8 is in the thousandths place (value: 8 × 0.001 = 0.008)
Value of 4 = 40
Value of 5 = 5
Value of 6 = 0.6
Value of 7 = 0.07
Value of 8 = 0.008
Value of 4 = 40
Value of 5 = 5
Value of 6 = 0.6
Value of 7 = 0.07
Value of 8 = 0.008
• Decimal place values: Each position to the right decreases by a factor of 10 (0.1, 0.01, 0.001...)
• Systematic approach: Work from left to right for both sides of decimal
• Verification: Ensure all digit values sum to the original number
Numbers with multiple zeros: Each position still has a place value, even if the digit is zero.
7 is in the hundred thousands place (value: 7 × 100,000 = 700,000)
0 is in the ten thousands place (value: 0 × 10,000 = 0)
8 is in the thousands place (value: 8 × 1,000 = 8,000)
0 is in the hundreds place (value: 0 × 100 = 0)
9 is in the tens place (value: 9 × 10 = 90)
0 is in the ones place (value: 0 × 1 = 0)
Value of 7 = 700,000
Value of 0 = 0
Value of 8 = 8,000
Value of 0 = 0
Value of 9 = 90
Value of 0 = 0
700,000 + 0 + 8,000 + 0 + 90 + 0 = 708,090 ✓
Value of 7 = 700,000
Value of 0 = 0
Value of 8 = 8,000
Value of 0 = 0
Value of 9 = 90
Value of 0 = 0
• Zero handling: Zeros still represent their place value even though the product is 0
• Place value preservation: Every position matters in the number's structure
• Verification: All digit values must sum to the original number